CVE-2026-31528

In the Linux kernel, the following vulnerability has been resolved: perf: Make sure to use pmu_ctx->pmu for groups Oliver reported that x86_pmu_del() ended up doing an out-of-bound memory access when group_sched_in() fails and needs to roll back. This *should* be handled by the transaction callbacks, but he found that when the group leader is a software event, the transaction handlers of the wrong PMU are used. Despite the move_group case in perf_event_open() and group_sched_in() using pmu_ctx->pmu. Turns out, inherit uses event->pmu to clone the events, effectively undoing the move_group case for all inherited contexts. Fix this by also making inherit use pmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context. Similarly, __perf_event_read() should use equally use pmu_ctx->pmu for the group case.

The following products are affected by CVE-2026-31528 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-31528.

URL	Resource
https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b
https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4
https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97
https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace
https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1
https://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31528-b375@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-31528
https://www.cve.org/CVERecord?id=CVE-2026-31528